Simultaneous deregression of cow and bull breeding values

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

Abstract

The next step to increase the accuracy of genomic prediction is to extend reference populations with cows next to daughter proven bulls. Cows typically have estimated breeding values (EBV) with considerably lower reliabilities compared to bulls. This suggests that commonly used (approximate) deregression procedures for bulls may not be appropriate for cows. The objective of this study was to test an alternative approach to simultaneously de-regress EBV of cows and bulls, and to derive appropriate weights for those de-regressed EBV. First, the appropriate weights of the de-regressed EBV were derived, and then the de-regressed EBV were computed using those weights. The analyses showed that the methods were well able to accurately de-regress EBV and compute their weights, both for bulls and cows. Despite observed discrepancies between intermediate results and simulated values, final EBV and reliabilities correlated very well with original values.
Original languageEnglish
Title of host publicationProceedings of the Interbull Meeting
Pages63-67
Volume48
Publication statusPublished - 2014
EventInterbull Meeting, Berlin, Germany -
Duration: 20 May 201421 May 2014

Conference

ConferenceInterbull Meeting, Berlin, Germany
Period20/05/1421/05/14

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breeding value
bulls
cows
genomics
prediction
testing

Cite this

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title = "Simultaneous deregression of cow and bull breeding values",
abstract = "The next step to increase the accuracy of genomic prediction is to extend reference populations with cows next to daughter proven bulls. Cows typically have estimated breeding values (EBV) with considerably lower reliabilities compared to bulls. This suggests that commonly used (approximate) deregression procedures for bulls may not be appropriate for cows. The objective of this study was to test an alternative approach to simultaneously de-regress EBV of cows and bulls, and to derive appropriate weights for those de-regressed EBV. First, the appropriate weights of the de-regressed EBV were derived, and then the de-regressed EBV were computed using those weights. The analyses showed that the methods were well able to accurately de-regress EBV and compute their weights, both for bulls and cows. Despite observed discrepancies between intermediate results and simulated values, final EBV and reliabilities correlated very well with original values.",
author = "M.P.L. Calus and G.C.B. Schopen and R.F. Veerkamp",
year = "2014",
language = "English",
volume = "48",
pages = "63--67",
booktitle = "Proceedings of the Interbull Meeting",

}

Calus, MPL, Schopen, GCB & Veerkamp, RF 2014, Simultaneous deregression of cow and bull breeding values. in Proceedings of the Interbull Meeting. vol. 48, pp. 63-67, Interbull Meeting, Berlin, Germany, 20/05/14.

Simultaneous deregression of cow and bull breeding values. / Calus, M.P.L.; Schopen, G.C.B.; Veerkamp, R.F.

Proceedings of the Interbull Meeting. Vol. 48 2014. p. 63-67.

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

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AU - Veerkamp, R.F.

PY - 2014

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N2 - The next step to increase the accuracy of genomic prediction is to extend reference populations with cows next to daughter proven bulls. Cows typically have estimated breeding values (EBV) with considerably lower reliabilities compared to bulls. This suggests that commonly used (approximate) deregression procedures for bulls may not be appropriate for cows. The objective of this study was to test an alternative approach to simultaneously de-regress EBV of cows and bulls, and to derive appropriate weights for those de-regressed EBV. First, the appropriate weights of the de-regressed EBV were derived, and then the de-regressed EBV were computed using those weights. The analyses showed that the methods were well able to accurately de-regress EBV and compute their weights, both for bulls and cows. Despite observed discrepancies between intermediate results and simulated values, final EBV and reliabilities correlated very well with original values.

AB - The next step to increase the accuracy of genomic prediction is to extend reference populations with cows next to daughter proven bulls. Cows typically have estimated breeding values (EBV) with considerably lower reliabilities compared to bulls. This suggests that commonly used (approximate) deregression procedures for bulls may not be appropriate for cows. The objective of this study was to test an alternative approach to simultaneously de-regress EBV of cows and bulls, and to derive appropriate weights for those de-regressed EBV. First, the appropriate weights of the de-regressed EBV were derived, and then the de-regressed EBV were computed using those weights. The analyses showed that the methods were well able to accurately de-regress EBV and compute their weights, both for bulls and cows. Despite observed discrepancies between intermediate results and simulated values, final EBV and reliabilities correlated very well with original values.

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Calus MPL, Schopen GCB, Veerkamp RF. Simultaneous deregression of cow and bull breeding values. In Proceedings of the Interbull Meeting. Vol. 48. 2014. p. 63-67